低于 4K 温度工作的二级脉管制冷机研制

Development of a two stage pulse tube refrigerator working below 4K

介绍最近研制的一台双向进气带第二小孔阀型二级脉管制冷机实验情况。该机采用计算机时序控制，脉管热端均处于室温。文中给出了二级脉管制冷机的基本结构尺寸以及试验结果：一级脉管达到４５Ｋ；二级脉管无负荷最低制冷温度达到３．１Ｋ。能稳定、长期工作，讨论了影响制冷机性能的主要因素。

In this paper an experimental investigation on a recently developed two stage double inlet pulse tube refrigerator with a minor orifice is introduced. It is controlled by a computer and solenoids. The test results and the basic configuration of the two stage pulse tube refrigerator are presented. The first stage temperature was 45K. The lowest temperature of 3.1 K was achieved at the cold end of the second stage pulse tube, while the hot end of the pulse tube was located at the room temperature. The refrigerator can work at a stationary state for a long time. The main factors effecting the refrigerator performance are also discussed.